Street-lamp



(No Model.) 2 Sheets-Sheet 1.

D. J. PRENDERGAST.

STREET LAMP.

No. 597,546 Patented Jan. 18,1898.

Witnesses. Inventor.

fidw/z Attorney.

(No Model.) 2 Sheets-Sheet 2, D. J. PRENDERGAST.

STREET LAMP. No. 597,546. Patentefi Jan. 18, 1898.

Witnesses.

"Attorney.

'tions or elevation and with sustaining pivla'rgest diameter with ventilating-apertures U ITED STATES DANIEL J. PRENDERGAST, OF NEW Y ORK, N. Y., ASSIGNOR TO THE PENN- SYLVANIA GLOBE GAS LIGHT COMPANY, OF PENNSYLVANIA.

STREET-LAM P.

SPECIFICATION forming part of Letters Patent No. 597,546, dated January 18,

Application filed February 27, 1897.

To aZZ whom it may concern:

Be it known that I, DANIEL J. Pamvnnn- GASI, of the city and county of New York and State of New York, have invented an Improvement in Street-Lamps, of which the following is a specification.

My invention has reference to street-lamps; and it consists of certain improvements which are fully set forth in the following specification and shown in the accompanying drawings, which form a part thereof.

My improvements comprehend certain features of construction more particularly directed to the inclosing globe, ventilating-cap, and supporting structures rather than the burner per se, the latter forming subject-matter of other applications.

In cz'irrying out my invention I provide a vertical adjustable annular frame which supports the ventilating-cap, the reflector, and deflector above the glass globe, while the lat ter is open at the top and supported at the bottom. upon a suitable base-cap directly sustained by the lamp post or socket. The vertical adjustable frame is, furthermore, provided with means to lock it in different posioted arms designed to be turned under the glass globe to support it in a raised position to permit access to the burners. The dome of the ventilating-cap is provided about its in the form of letters to designate the street, thereby performing a dual function. The illumination produced by reflection through the said letters renders them most brilliant and readily readable. The deflector is arranged within the dome and directly supported thereby, so that it remains stationary above the burners and permits the globe to be moved upward between the dome and the deflector. The function of the deflector is twofold--namely, to force downward the air entering the lamp, so that it shall flow tothe burners and be heated on its Way, and, secondly, to deflect the rays of light downward onto the street and thereby assist the reflector arranged upon the outside.

My improvements will be better understood by reference to the accompanying drawings, in which- Serial No. 625,269. (No model.)

Figure 1 is an elevation of my improved lamp with the upper portion in section. Fig. 2 is a sectional plan view of same on line y y. Fig. 3 is asectional plan view of same on line a; :0. Fig. a is an elevation of my improved lamp with the globe raised for trimming purposes, and Fig. 5 is a similar view with both the globe and the dome bodily raised clear of the burners.

A is the socket, attached to the shaft of any suitable lamp-post. Bolted to this socket are the upwardly-extending arms A. Sleeved upon these arms are tubes 13, secured at their tops to an annular frame or ring B. The rods A are notched, as at a, and the tubes or sleeves B are provided with catches or locks 19, adapted to said notches, so that the ring B may be lifted and locked in an elevated position.

E is a reflector, of metal, suitably supported upon the said ring B and preferably whiteenameled. Fitting over this reflector and centered by a flange thereon is the dome F, which is formed of metal and also preferably whiteenameled. This dome is somewhat enlarged at the base and formed at said portion with perforations F, adapted to correspond to letters designating the street, as indicated in Figs. 4 and 5. The dome is held to the annular frame or ring 13 by means of retainingscrews E or in any other suitable manner. The said screws also hold the reflector E from disengagement. Secured to the upper part of the dome F is the ventilator G, which may be formed in any suitable manner, but preferably with a fluted band g, secured to it to form ventilating-apertures above and below said band, which permit the ready escape of products of combustion, but prevent currents of air flowing or blowing into and down the lamp. This ventilator may be formed in any other suitable manner desired.

H is a chimney-tube arranged within the dome and hung from the top of the ventilator by means. of a depending rod 1 and a crossbar h. The rod is provided with a screw-threaded end and nut by which the chimney may be adjusted vertically, so as to vertically adjust the deflector H, secured to the bottom of the chimney. The chimney preferably closes the lower part of the ventilator, so as to prevent ready passage of air from the dome directly to the ventilator. The deflector II is made annular and formed with an upwardly-extending flange h, which is arranged within the dome F and immediately back of the apertures f. This deflector is also preferably enameled white, so that it reflects the light with great brilliancy. Furthermore, the deflector imparts heat to the incoming air, so that the same is warmed prior to passing down to the burners.

J J represent two burners of the incandes cent type, and the gas supplied thereto is controlled by a suitable valve L. Immediately above the incandescent burners are arranged tubes or shields K, which direct the heat from the bu rners into the chimney II. These tubes form no part of the present invention. Surrounding the burners and Within the space bounded by the sleeves or tubes B is arranged a glass globe O, which is made open at the top and cylindrical, so as to be guided within the annular frame or ring B. The globe has a diameter sufficient that it will move up between the annular space formed between the deflector and the outer wall of the dome to permitthe globeto be raised. The lower part of the globe is contracted and rests upon a base-plate D, which consists of a light metal casting having two glass windows D and an aperture for lighting the burner closed by a pivoted screen-door D (See Fig. 3.) This base-plate is supported upon a sleeve d,which encircles the gas-pipe leading to the burner from the lamp-post.

Normally the parts are in the position'shown in, Fig. 1, and in operation the air passes through the apertures f and also above the upper edge of the globe, thence downward under the inner surface of the globe to the burners, and the heated products of combustion pass up through the chimney H and thence out by the ventilator G. Any side drafts are intercepted by the fluted part of the ventilator, but will pass into the lamp by the apertures f for supplying the incandescent burners. In this manner the draft is always in the right direction. The draft is also assisted by the screen-door (Z in the baseplate. The light, in addition to its direct radiation, is reflected from the reflector E down upon the street and is also reflected by the surfaces of the deflector H, so as to cause part of the light to pass downward onto the street and part up into the dome, so as to be reflected out through the apertures f to illuminate the letters formed thereby.

When it is desired to raise the globe slightly, this may be accomplished by simply lifting the globe and turning in the supporting-arms B which are jointed to the bottoms of two,

of the tubes 13. This adjustment is clearly shown in Fig. at. If, however, it is desired to secure full access to the burners, the parts, when adjusted as in Fig. 4, are lifted bodily upon the rods A and the locksor notches I) adjusted to hold the parts in the elevated position, as indicated in Fig. 5. It will thus be seen that in this construction the base-plate D remains stationary and in the normal operation takes all the weight of the globe C. In practice the joint between D and O is more or less open, so that a reasonable amount of air passes through this joint to supply the burners. It is evident that any other form of supporting-arms and locks may be used in place of the parts shown, if desired. It is furthermore understood that the deflector may'be used without the apertures f in the dome, if so desired. W Vhile in practice the construction of the reflector E is most preferable and desirable, it is to be understood that the same is not essential to my invention.

hile I prefer the construction shown, I do not limit myself to the minor details thereof, as the'same may be modified without departing from the principle of my invention.

hat I claim as new,'and desire to secure by Letters Patent, is-

1. In a street-lamp, the combination of an annular frame or ring supported above the top of the lamp-post, a dome carried by said ring and terminating at. the top in a ventilator, a burner secured at the top of the lamppost,,an inclosing globe open at the top and guided within the ring,a stationary base-plate carried upon the top of the lamp-post and uponwhich the globe normally rests, and pivoted arms supported by the lamp-post and adapted to be turned under the globe when partly raised to hold it in an elevated position above the base-plate.

2. In a street-lamp, the combination of an annular frame or ring supported above the top of the lamp-post,'a dome carried by said ring and terminating at the top in a ventilator, a burner secured at the top of the lamppost, an inclosing globe open at the top and guided within the ring, a stationary baseplate carried upon the, top of the lamp-post and upon which the globe normally rests, pivoted arms supported by the lamp-post and adapted to support the globe when partly raised, and means for adjusting said pivoted arms vertically so as to sustain the globe at different elevations relatively to said baseplate.

3. In a street-lamp, the combination of an annular frame or ring supported above the top of the lamp-post, a dome carried by said ring and terminating at the top in a ventilator, a burner secured at the top of the lamppost, an inclosing globe open at the top and guided within the ring, a stationary baseplate carried upon the top of the lamp-post and upon which the globe normally rests,

.pivoted arms for supporting the globe movable with the ring and adj ustably connected so as to be capable of turning under the globe, and means interposed between the ring and the lamp-post for adjusting the said ring vertically together with the dome and the pivoted arms whereby the dome and globe may both be elevated relatively to the burner.

IIO

t. In a street-lamp, the combination of an annular frame or riugsupported above the top of the lamppost, a burner secured at the top of the post, an inclosing globe open at the top and having its upper part within the ring, a reflector having its inner edge provided with an upwardlyextending portion resting upon the annular frame or ring and detachable therefrom, a dome supported slightly above the ring and resting upon the reflector just outside of the upwardly-extending portion, means for detachably hold-- ing the reflector and dome to the annular frame or ring, and a ventilator above the dome of greater diameter at its base than the dome.

5. In a street-lamp, the combination of an annular ring supported above the top of the lamp-post, a dome carried by said ring and terminating at the top in a ventilator, a burner secured at the top of the lamp-post, an inclosing globe open at the top and guided within the ring, a stationary base-plate carried upon the top of the lamp-post and upon which the globe normally rests, a deflector supported within the dome and having an annular space between the said deflector and wall of the dome and a central chimney-aperture above the burner, and means for adjusting the globe vertically between the dcflector and the wall of the dome.

(3. In a streetdamp, the combination of an annular ring supported above the top of the lamp-posha dome carried by said ring having ventilating-apertures close to its bottom and terminating at the top in a ventilator, a

' burner secured at the top of the lamp-post,

'7. In a street-lamp, the combination of a.

burner, a vertically-adjustable globe surrounding said burner and open at the top, a dome of greater diameter at its base than the globe so as to receive the globe when adjusted vertically and having air-apertures near its bottom, and an annular deflector having a horizontal deflecting-surface of smaller diameter than the globe arranged and supported within the dome but extending almost to the globe and formed with an upwardly-extending enameled band at its perimeter whereby the globe may be adjusted vertically relatively to the burner and be guided between the dome and deflector and the light be re filected outward and air downward into the g obe.

8. In a street-lan1p, the combination of a burner, a vertically-adjustable globe survertically and provided with apertures in the form of letters for permitting the entrance of air and the passage of light, and an annular.

deflector of smaller diameter than the globe and arranged within the dome whereby the globe may be adjusted vertically relatively to the burner and be guided between the dome and the deflector.

9. In a street-lamp, the combination of a burner, a vertically-adjustable globe surrounding said burner and open at the top, a

globe so as to receive the globe when adjusted vertically, an annular deflector of smaller diameter than the globe and arranged within the dome whereby the globe may be adjusted vertically relatively to the burner and be guided between the dome and deflector, and means for simultaneously adjusting the dome, the deflector and the globe relatively to the burners.

10. In a street-lamp, the combination of the lamp-post, a burner arranged upon the upper part thereof, an annular frame supported by the post at a distance above the burner, a dome Wholly independent of the glass globe arranged above and supported by said annular frame and having its walls at the lower part close to the annular frame perforated or open for the admission of air and the passage of light, a glass globe surrounding said burner arranged below and within said annular frame and adjustable vertically within and independently of the dome, and a chimney and ventilator extending above the dome for permitting the escape of the products of combustion from the burner.

11. In a street-lamp, the combination of the lamp-post, a burner arranged upon the upper part thereof, an annular frame supported by the post at a distance above theburner, a dome wholly independent of the glass globe arranged above and supported by said annular frame and having its walls at the lower part close to the annular frame perforated or open for the admission of air and the passage of light, a glass globe surrounding said burner arranged below and within said annular frame and adjustable vertically within and independently of the dome, a chimney and ventilator extending above the dome for permitting'the escape of the products of combustion from the burner, an annular horizontal deflector independent of the globe arranged within the dome and above the burner so that the globe maybe adjusted vertically between the deflector and dome, and mechanical connections for supporting the deflector stationary relatively to the movable globe.

12. In a street-lamp, the combination of a burner, a globe surrounding said burner, a dome arranged above said globe and having its Walls perforated for the admission of air and the passage of light, a chimney and ven- IIO tilator extending above the dome for permitting the escape of the products of combustion from the burner, and an annular deflector arranged Within the dome and above the burner and provided with an upwardly extending 7 of the globe perforated in the formof letters to permit the entrance of air and the passage of light and also act as a street-sign.

14; In a street-lamp; a glass globesurrounding the burner, a supporting-frame for guidingthe upper end of the globe,.and a dome terminating'in' a ventilator at the'top and having its lower portion adjacent to the top of the globe perforated in the form of letters to permit the entrance of air and the passage of light and also act as a street-sign, and a deflector arranged above the burner and within the base of the dome.

15. In a street-lamp, the combination of a burner, a supporting annular frame, a glass globe surroundingthe burner and vertically adjustable relatively to the annular frame and dome, a stationary dome arranged above and supported by the annular frame independently of the said globe so as to permit the burner and suspended within the dome independently of the globe and of a diameter almost equal to that of the glass globe.

16. In a street-lamp, the combination of a burner, a glass globe surrounding the burner,

a dome arranged above the said globe so as to permit the passage of air and terminating in a ventilator at the extreme top, an annular deflector having a horizontal detlectingsurface arranged above the burner and sus pended within the dome and'of a diameter almost equal to that of the glass globe and having a central opening for the passage of the products of combustion from the burnen and means connecting the deflector'with the ventilator to adjust the deflector vertically relatively to the dome and burner.

17. In a street-lamp, the combination of the post, a burner upon the post, a verticallyadjustable' globe surrounding the burner, an annular frame carried by the post and sur rounding the upper part of the globe, a circular street-sign having transparent letters or numbers, a dome arranged above the annular frame and the street-sign, a deflector arranged within the lamp below the dome and provided with a central chimney-flue, and a ventilator-cap surrounding the dome and above the central flue of the deflector.

In testimony of which invention I hereunto set my hand.

DANL. J. PRENDERGAST.

\Vitnesses:

SAML. H. HOEST, NATHAN Y. NEWALL. 

